At first the author states:

The findings, which the researchers said suggest that social media users tend to merely read headlines and blurbs rather than fully engage with core content, appeared today (Nov. 19) in Nature Human Behavior. While the data were limited to Facebook, the researchers said the findings could likely map to other social media platforms and help explain why misinformation can spread so quickly online.

This implies all social media users. Later it mentions sharing information.

If I cared , I would read the paper. I think the author didn’t do a very good job from headline on.

I don’t read 90% of the articles because they’re mostly crap.